package com.ukefu.ask.util.query;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.metrics.tophits.TopHits;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;

import com.ukefu.ask.web.model.UKAgg;

public class UKAggTopResultExtractor extends UKResultMapper {

	private String term, name;

	public UKAggTopResultExtractor(String term, String name) {
		this.term = term;
		this.name = name;
	}

	@Override
	public <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> clazz, Pageable pageable) {
		Aggregations aggregations = response.getAggregations();
		Terms agg = aggregations.get(term);
		long total = agg.getSumOfOtherDocCounts();
		List<T> results = new ArrayList<T>();
		if (agg.getBuckets() != null) {
			for (int i = pageable.getPageNumber() * pageable.getPageSize(); i < agg.getBuckets().size(); i++) {
				Terms.Bucket entry = agg.getBuckets().get(i);
				if (!StringUtils.isBlank(name) && entry.getAggregations().get(name) != null) {
					TopHits topHits = entry.getAggregations().get(name);
					for (SearchHit hit : topHits.getHits().getHits()) {
						T data = mapEntity(hit.getSourceAsString(), hit, clazz);
						if (data instanceof UKAgg) {
							((UKAgg) data).setRowcount((int) topHits.getHits().getTotalHits());
						}
						results.add(data);
					}
				}
			}
		}
		return new AggregatedPageImpl<T>(results, pageable, total);
	}
}
